D4F Senior Member Joined: 15 Mar 2012 Posts: 1,198 Location: USA Expertise: I like coffee
Espresso: Gaggia Classic PID Grinder: Preciso
Posted Sun Feb 10, 2013, 1:32pm Subject: Re: Temp/pressure gauge
I understand the gauge, fairly standard set up. Static only, or does it have an adjustment for shot simulation?
I played a bit with thermofilters, below, and pose a few of the potential problems. It can work, and you may have already used it, though you have not said.
Again, static or flow simulation. If I understand the concept, you will fit the device on the bottom of a PF and then not be able to use a basket as there is no seal from the basket to the thermofilter. What will fill the basket deadspace? If water, then you are using a fair amount of water, not actually like a puck. Again, flow is important.
How will you avoid water penetrating along the thermocouple insulation, is it so sealed that water cannot get between the wire and insulation?
Posted Sun Feb 10, 2013, 3:26pm Subject: Re: Temp/pressure gauge
D4F Said:
I understand the gauge, fairly standard set up. Static only, or does it have an adjustment for shot simulation?
I played a bit with thermofilters, below, and pose a few of the potential problems. It can work, and you may have already used it, though you have not said.
Again, static or flow simulation. If I understand the concept, you will fit the device on the bottom of a PF and then not be able to use a basket as there is no seal from the basket to the thermofilter. What will fill the basket deadspace? If water, then you are using a fair amount of water, not actually like a puck. Again, flow is important.
How will you avoid water penetrating along the thermocouple insulation, is it so sealed that water cannot get between the wire and insulation?
Yes, the thermocouple is sealed, but no filler for the dead space as of yet, and no valve either.
The gauge works as it should giving a static reading (I've got my Grimac Mini set to 9.5 bar static, so around 8.5 bar with the flow).
Temperature is another story as you indicated without a simulated puck taking up the void, I'm getting readings of a full portafilter, which I suspect are going to be much lower than the water that's hitting the top of a puck.
D4F Senior Member Joined: 15 Mar 2012 Posts: 1,198 Location: USA Expertise: I like coffee
Espresso: Gaggia Classic PID Grinder: Preciso
Posted Sun Feb 10, 2013, 3:46pm Subject: Re: Temp/pressure gauge
Yep, the gauge is the easy part. You can add in a needle valve for flow regulation. Some flow will be needed for an accurate temperature reading. Epoxy and talc, microballoons, or other filler in the epoxy can be used, and I used a circle of HDPE plastic as described in the above thread.
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